To conquer, overcome, or subdue through war; to bring under control by force.
From Latin debellare (to overcome in war), formed from de- (against, down) and bellum (war), with the Latin infinitive ending -ate. This formal Latin-based verb is quite rare in English.
This word appears in English texts about military history and classical Rome, where it was used to describe the ambitious conquests of emperors—it's the kind of elevated language that makes military accounts sound majestic rather than brutal!
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